3-point levelling for Ultimaker Original (with heated bed)

After installing a heated bed, I designed this simple 3 point levelling system.
You need to print

• 2x frontup
• 1 bottomUp
• 3 wheels

You need 6 M3x10 screws, 3 M3x40 screws, 6+4 M3 nuts, 3 (or 6) washers and 3 springs.
You can use the existing holes for the front parts but you must drill three 3mm holes for the bottom.

You can use PLA for bed temperature equal or less than 60 °C (there is very little heat transmission to the plastic pieces). I do not try with higher temperature.