Bambu Bed Buddy: A wrench to save your fingers

Update 1/28/24:  Added a new version with 90 degree-increment tactile and visual marking in the model, if you prefer to measure your turns by quarter or larger turns.  See “BambuBedBuddy_90DegreeMarks.3mf” if you want these ribbings that indicate how much you've turned. Picture:

Bambu Bed Buddy is a printable wrench that helps you tram/level the bed of your BambuLab printer with the gantry/printhead. It is compatible with all BambuLab models as far as I know, and it can improve the quality and consistency of your prints.

Bambu Bed Buddy lets you turn the 3 screws under the bed as part of the official bambu tramming procedure here, but without destroying your thumbs! The 12-sided knobs under the bed are very tight by design, which makes them a little tricky to fine-tune without a tool. After getting very frustrated with doing this and hurting my thumbs, I designed this tool to help. I hope this helps others!

Additionally, it is important to note that the tightening procedure needs to be started all over again if you fail to complete it in the first 3 passes! The key part is that this requires starting with the knobs from a very tight “neutral” position, so that you don't end up with them too loose. This is pretty annoying, and needed to be fixed.

Part of the problem is that Bambu's provided GCODE file only iterates 3 times and (especially if you're not using the wrench here!) gives you not enough time to adjust and fine-tune the knobs. To fix this second problem, I simply extended the number of repeats in the included GCODE file here so that it will repeat the 15-second-per-spot sequence for 30 minutes, which should provide ample time for even the most OCD tuners :). I recommend trying to use this file to save on frustration instead of the Bambu one, but the wrench will of course work either way.

Shown here printed in Prusament Galaxy Black PLA, 4 walls, 0.2 layer height. The resulting fit is tapered slightly, but will be tight to aid in minimal backlash. If you want to check for fit first to see if you need scaling, I've included a small test print. Print the wrench and test piece with the socket of the wrench facing UP (away from the bed).