Geeetech i3 to MK3S Conversion by StanSPP

Last crawled date: 3 years, 3 months ago

I was never really happy with the original geometry of the Geeetech i3 Pro B, especially after upgrading to a MK3 style 220x220mm heated bed because I was struggling to get the nozzle to use the full width of the bed. Even after swapping the original Geeetech MK8 extruder for a BMG clone and a V6 hotend I couldn’t get the nozzle to the edges of the bed without hitting the Lead screws.
Also, I always felt the X-axis assembly had too much play in it and I felt it was preventing me getting a reliable first layer. Therefore, I designed these replacement parts so I could convert the i3 Pro B to the standard Prusa MK3S geometry. The new top mount and Z-motor housing parts move the smooth linear rods and T8 Lead screws for the Z Axis out slightly so that you can use the standard Prusa MK3S parts for the X Axis assembly. If you are brave you could cut down your original x-axis linear rods to 370mm to match the Prusa size but I ordered new ones to make sure I had the option of going back if I needed to.
The main 4 parts (2x Tops & 2 x Motor housings) should fit the standard Pro B acrylic frame using the original bolts and square nuts with a few spare. They will also be much stiffer because each z-axis motor housing is now one piece rather than 3.
I printed mine using ABS and a layer height of 0.2 mm but as there is very little thermal stress on these I guess PLA should work fine too.
If you're using a probe as your Z endstop you can use the standard Prusa MK3S parts to make the X Axis assembly. However, I added an updated X-axis motor housing part and a microswitch mount that can be attached to the matching z-motor housing if you are planning to use the original Geeetech microswitch style endstop (note: I have not tested this myself as I'm using an inductive probe for my setup).