June 2, 2026
Description
This project turns your beloved Prusa Core One into an impenetrable fortress. No failed prints shall breach its walls! No layer shifts shall trespass! This build will elevate your humble machine into a heavily fortified bastion of additive manufacturing.
The Top crown of walls and towers include one storage unit per tower. Pretty neat!
I keep all my roasted onions here! What will you keep in yours?
The Side of the printer now includes a Jail bar with a magnetized door. This really adds a flair to the look of the model but this area can also be used to store certain items.
This project do not provide any designs for storage solutions for the side wall. But there are a ton of models here on Printables that are compatible with this door, for example: tool hangers, print sheet holders or small bins. Go out and explore!
The side panels and the top are simply mounted with magnets, so if you for some reason wants to revert the printer back to original it is as simple as just removing the side walls and the crown.
The most work to revert is to change the gearbox cover, which is only three screws!
The vents are still fully functional with this model!
In this section you will find some general information about the project and how it was made.
This project uses a lot of filament, an absurd amount of 6mm magnets and some superglue.
When it comes to the side walls there are two walls to choose from. The Regular Side Wall with a open face or the Jail bar Side Wall. Either you can have one of each, or you can pick the same wall for booth sides. Note that the Jail bar Side Wall uses 8 more Magnets than the Regular Side Wall.
Just note that the Jail bar Side Wall is not compatible with the newer version of the Prusa Core One + Spool holder, as it protrudes a bit outside the printer dimensions. If you want to use the Jail bar Side Wall for the spool side, please make sure that you have a compatible spool holder. If you have an incompatible spool holder and you really want the Jail bar on the Spool Side, please print a new spool holder.
All modeling was done in Autodesk Fusion using the Prusa Core One Cad files to measure the dimensions of the printer.
After modeling I used a Website called BumpMesh.com to create the texture of the brick and wood features. Thanks to CNC Kitchen for providing such an easy to use tool.
Thin screwdriver for prying off custom supports
Pliers for removing custom supports
T10 / TR10 screwdriver or allen key for mounting the new gearbox cover
A tweezer for placing Crest pieces
Superglue
62 - 78pcs of 6mm magnets depending on which side walls you want to make
Around 1,5 kg of filament in various colors
The Magnets are simple 6mm diameter, 2mm height coin magnets. They are fairly inexpensive and can be bought in a lot of places.
All of the models use the exact same print setting with one exception, the Jail bars and the Jail plug. For the Jail bars and Jail plug please look at the Jail bar specific print settings. Everything else uses the General print settings.
No models need generated supports, although some pieces have custom supports build into the model.
All models have been positioned in it's optimal print orientation so no tweaking of position is needed.
This project was printed with only PETG. I can not recommend PLA for the Gearbox cover parts as they are positioned inside the chamber. The heat of the chamber might deform PLA over time. The Outside pieces should however be okay with PLA. But I used PETG for all my prints in this project.
All models have notes connected to the files for you to know how many of them will be needed to finish this project.
Nozzle | 0.4 mm |
Filament | PETG |
Supports | None |
Infill | 5% |
Layer Height | 0.2 mm |
Perimeters | 2 |
The orientation of the Jail bars makes it so that the cylinders are printed in a weak orientation. Because of this I think it's worth beefing up the settings a bit so that no accidents will occur. The following settings are recommended for the models:
Jail bar top and bot
Jail bar Plug
Nozzle | 0.4 mm |
Filament | PETG |
Supports | None |
Infill | 20% |
Layer Height | 0.2 mm |
Perimeters | 4 |
Also you might want to paint custom seams for the Jail bars. Put the seams on the back of the model so that they will not be visible in the final product.
This seam painting is also relevant for the Jail bar mid piece. Paint the seam on the back to get rid of ugly seams on the front of the model.
The Assembly is split into three sections:
Top - Where you will assemble the towers and walls around the top of the printer.
Sides - Where you will assemble the side walls of the printer with or without the Jail bars.
Gearbox Cover - Where you will assemble the Gearbox cover with the nozzle crest.
The top assembly is divided into two parts. The first part is assembling the towers and the second is assembly of the walls and then connecting them to the towers.
The following section needs to be completed four times. Items bellow will be listed to make one example.
You will need:
1 Tower top
1 Tower mid
1 Tower bot
2 Tower Window
2 Tower Windowsill
2 Tower plugs
1 Tower Lid
2 Magnets
Start by taking the Tower bot and put some superglue in the holes on the back. Put a magnet in each hole. The tolerances are pretty tight so it might be difficult to squeeze them in. I used the back of a screwdriver to push it in firmly.
Then flip the piece over and locate two square holes. Put some superglue in the holes and push the two Tower plugs in the holes. Make sure they are pushed all the way in.
WARNING!!
When aligning the Tower mid piece with the Tower bot piece only one orientation works. The side facing the print sheet while printing on the Tower mid piece should be facing towards the Tower bot piece. The holes only align properly in one direction so please don't force the piece out of shape. If they don't align, flip the Tower mid piece over.
Add a line of superglue in the highlighted area.
Align the holes on the Tower mid piece to the Tower plugs and squeeze the two pieces together.
Put some superglue in the holes and the highlighted areas on the Tower top piece.
Then align the Tower plugs with the holes on the Tower top piece and squeeze them together. Hold them together firmly for a while to let the glue set.
Before we move on, let's talk about the Tower windowsill for a bit.
The windowsill has two small indentations on the top side on the back. These indentations need to be placed on the inside of the window hole facing up. There is also one smooth edge and one rough edge. In the image bellow you see the rough edge. This rough edge must point outwards when mounting the windowsill in the tower piece.
Put some glue in the highlighted area and put the Tower Window in the place. Push it upwards so it fits in the highlighted area.
Then put some superglue in the place underneath the seated window and place the Windowsill in its correct orientation right underneath the window. The tolerance is pretty small but it should fit. Some force might be required.
Put some superglue in the highlighted area and push the Window plank in the area. Now repeat this process on the other window hole on the Tower Piece.
Now simply place the Tower Lid on top of the tower. One Tower is now complete! But since you need four towers, you have to repeat the Tower section three more times before moving on.
The following section needs to be completed four times. Items bellow will be listed to make one example.
You will need:
1 Wall top
1 Wall plank
First inspect the inside of the Wall top piece. There may be some light stringing that needs some cleanup. It's not a big deal since it will be hidden by the plank but it may be a bit difficult to fit the plank if there is too much extra material in the way. But ultimately some excessive force and a bit of violence will work if you are too lazy to clean it up.
Inspecting the side of the Wall plank you can see that one side is slightly chamfered. This side should be aligned with the outer side of the Top Wall for easier assembly.
Put a line of superglue on the entire length of the wall where the plank will sit.
Then, with all your might, push the plank into it's place until it is firmly seated into the slot.
Nicely done! Now repeat the Top Wall section until you have a total of four walls.
For this step you will need:
4 assembled towers
4 assembled walls
Put some superglue in the suspiciously wall looking hole and jam a side of a wall in the socket.
A lot of glue might be required here and hold the pieces together firmly for a while to let the glue set.
Repeat this process until you have a square wall with a tower in each corner.
Let this piece sit for a bit. It might take some time for the glue to dry properly here.
When the glue is almost dry you can place it on the printer. It is actually a good idea to let the last bit dry on top of the printer so that the square has perfect alignment with the printer when it is fully dry. Just make sure that there is absolutely no wet glue dripping from the underside of the fixture so no glue touches the printer in any way.
Congratulations! The top is now fully assembeled!
The sides are a bit different depending on what you want to do. There are a regular wall and a wall with a Jail bar side.
Both walls will need Top Arches but then after that it's up to you if you want to make one or two of either Side Wall.
The following section needs to be completed twice, once for each side. Items bellow will be listed to make one example.
For this section you will need:
3 Side Windows
1 Buffer left and right
1 Arch top left
1 Arch top right
4 Upper plugs
2 Magnets
Please note that there are two different plugs that looks very similar. We are gonna use the upper plugs for this portion, which is a bit thinner.
Start with removing the custom supports from various parts.
Both Arch top left and right has small circular supports, simply snap them off with your fingers or some pliers.
The side windows has a super thin support. Just pluck it with your fingers, this applies for all three windows.
Looking at the buffer pieces you can see supports on the inner sides of them.
Use a small screwdriver to pry the piece of. It can be stuck there pretty firm so don't be afraid to give it some juice.
Same principle applies for the other buffer. This one might need some firm tapping to break through the support.
Put some superglue in the pit of the left buffer piece and slot the right piece into it. Press down firmly.
Next add some glue in the crevasse on the side and slot two plugs into the holes. Repeat on the other side.
The tolerances of the plugs are pretty tight so you might need to fiddle around for a bit. Make sure the plugs are set all the way down in the hole.
Align the left and right arch pieces accordingly. We are gonna attach the arch pieces in the corresponding slots in the buffer piece.
To do so first add superglue in all four slots in the buffer piece and then slot the arch pieces into the slots.
Then add some glue at the top part of the arch pieces and slide the two arch pieces together.
Patience is key here. Please let the glue set properly before moving on as it can make the whole structure pretty unstable otherwise.
Next add a line of superglue in the highlighted area and fit the side window into the slot. Repeat this step for all three windows.
Then flip the fixture around and locate a small hole on the top left corner. Add some glue and push down a magnet firmly into the hole. Repeat this step for the top right corner.
Nicely done! now you have one complete Top Arch piece.
Now you get to experience the joy to assemble one again as you need two of them. So please repeat all steps of this section again!
After having two completed Top Arch pieces please move on to either Jail bar Side Wall or Regular Side Wall.
This section is divided into two parts. The Jail bars and the Bottom square. We will first start with the Jail bars as it is cooler and more interesting.
You will need:
2 Jail bar top and bot
1 Jail bar min
2 Jail bar plugs
4 Magnets
Flip the Jail bar top and bot over and locate a hole on the left and right side. Put some superglue in the hole and slide in a magnet. These holes can be a bit weirdly shaped because of the print orientation. The magnet still fits but it is tight. I recommend pushing firmly on the magnet with the back of a screwdriver to make sure it gets squeezed in there.
Repeat this step on both sides for both Jail bar top and bot pieces.
ALSO WARNING!!!!!!!!
Please be aware of the magnet alignment in these holes as they need to attract a different magnet in a future step. You will be warned one more time when it is relevant.
Align one Jail bar top and bot with the Jail bar Mid according to the picture. Make sure that the studs on both pieces are facing up. Add superglue in all holes marked with circles. Then press the rods into the holes and hold the pieces together firmly for a bit to let the glue set.
Repeat the process on the other side of the Jail bar Mid with the other Jail bar Top and Bot.
Locate a small hole on the end of the Jail bar and put some superglue in it. Push the Jail bar plugs thick end into the hole as deep as it gets.
Repeat the process on the other side of the fixture so that both plugs are aligned like the picture.
Put the assembled Jail bar piece to the side.
Now we will begin assembling the bottom square.
You will need:
1 Square top Jail bar wall left and right
1 Square bot Jail bar wall left and right
1 Vertical square wall left
1 Vertical square wall right
6 Lower plugs
30 magnets (yes really)
Note that we are now using the thicker plugs.
WARNING!!
The Vertical square walls have one side on the back that has two diagonal circles. These must point up towards the Square top walls. If they are aligned the opposite they will not be able to fit on the printer properly later.
Put some glue in the Square top wall left and press a plug into the hole as deep as you can.
Repeat the above process and connect the pieces together putting glue on every hole with a plug in between until you have something like the picture bellow.
Stop connecting pieces here for now.
You will have a choice here, so think carefully. Depending on how you mount the jail bar into the square piece the orientation you open it will change. Either mount the Jail Bar plug on the left or right side of the Square wall, either is fine and is completely up for personal preference. I mounted it on the left side here.
WARINIG!!!!!
Now when mounting the magnets you have to be extremely careful to align the magnets properly. The Jail bar will close, connecting the magnets. Please, before mounting these magnets double check that the magnets will attract when the Jail bar is closed. And when you have double checked, check again for good measure. You have been warned.
Now when you are sure which alignment the magnets have, put some superglue in the holes and press down firmly to affix the magnet properly. Repeat this step on the other side as well using a total of four magnets here.
Glue the plugs to the holes and attach the last pieces to create the full square.
Flip the square over and locate the smaller holes marked with circles in the image bellow. Put a magnet in all (yes all) of the holes with some superglue to keep them in place.
Now prepare the assembled Top Arch piece
Locate the holes on the top of the Square and put glue in them, repeat on the other side.
Put a line of superglue on the edge of the Top Arch Piece, Then squeeze together to Square piece and the Top Arch piece. Hold firmly together for a bit so the glue can dry.
Nicely done! The Jail bar Side Wall is now fully assembled!
To mount the wall to the printer simply slap it on there. It should align perfectly with all the nylon rivets due to the small holes on the back of the wall.
Nicely done! The Jail bar Side Wall is now complete!
This portion is very similar to the previous portion, so the instructions here will be pretty simple. If you want a more detailed instruction, please view the Jail bar Side Wall portion and simply skip all the steps that refers to the actual Jail bar.
For this portion you will need:
1 Square top Regular bar wall left and right
1 Square bot Regular bar wall left and right
1 Vertical square wall left
1 Vertical square wall right
6 Lower plugs
1 Pre assembled Top Arch piece
26 magnet
Note that we are using the thicker plugs.
WARNING!!
The Vertical square walls have one side on the back that has two diagonal circles. These must point up towards the Square top walls. If they are aligned the opposite they will not be able to fit on the printer properly later.
Connect all the Square pieces together into a frame using the plugs with some superglue in between each piece to create a square.
Put some superglue and press a magnet into each hole marked with a circle on the right image.
Put some superglue on the Arch Top piece and connect the Arch top Piece together with the square frame.
You have now assembled a Side Wall Regular! That was fast!
Now throw it on there!
Hell yeah!
For this section you will need:
1 Crest Cover
1 Crest Frame
1 Crest Nozzle
1 Crest Top Left
1 Crest Top Right
1 Crest Bot Left
1 Crest Bot Right
Start with removing the custom supports.
With a small screwdriver, put it about halfway down the hole and pry the support off the cover. Repeat this step for all three holes.
Jam the screwdriver underneath the shield shaped support and pry it off.
Put some superglue on the cover and push the frame into place.
Put some glue on all corners and add the Crest top/bot left/right pieces in the corners of the frame.
Some tweezers makes this step significantly easier.
Put some superglue in the nozzle shaped area in the middle of the crest and then push the nozzle emblem into place.
You are now done with the assembly of the Gearbox Cover. Next step is to mount it on the printer.
A T10 / TR10 screwdriver or allen key is needed for this step.
First locate the gearbox cover on the extruder. Remove the three screws then carefully remove the cover from the gearbox.
Maybe you should take this opportunity to clean and apply some new lube to the gearbox, I know I should (I didn't).
Place the new Crest Gearbox cover on the gearbox and use the same screws as before to mount the cover.
Make sure not to overtighten these screws, stop when you start feeling resistance.
Great Job!! The printer is now fully pimped out and done!
If you have any questions or have any feedback, please message me.
If you like this project, please give it a like and post a photo of your make with a comment. Thank you!
License:
Creative Commons — Attribution — Share Alike
7
AlexanderOSV
