Prusa mk4 ergonomic handle

you will need the following materials to build this :

(1) 2x 12mm ID 32mm OD ball bearings  

https://benl.rs-online.com/web/p/ball-bearings/4420183?gb=s

(2) some kind of glue

(3) you will also need 3M threaded inserts I recommend these

https://www.amazon.com.be/-/en/Threaded-Sockets-Pressure-Ultrasonic-Printing/dp/B08BCRZZS3/ref=sr_1_5?crid=LHVULV8SPQGG&dib=eyJ2IjoiMSJ9.Xs_x4e4ZM2aII_D8u8WepRVEJteEEbldnQE38jvPQi-yeBMdyx7olrihadQfxV4S0iiObkl0rTb1xiRgVgMo2hKYcTl69Lx3kE55yM-L8QF4AKM1GFkm2J_QoCs-rseclU2PqAP_ONWyx5DmQ2Od9DK79700k0T_HoLHtFDxOdT7hwh2Rcv9TEJo6rdSgOe2MgefRXF4cCQ3CacnTciMN7mHv2ql8BsIN7MeWFh3YVKgsabFRD4LpxlNhdCgT-ElEe-OKEYzOsWIW-liQ-Pz2_tpbUzy8TAbbGdqkX7rF6Y.VtCPJgZd7uXCiW5VR3wyljcpOyK-ZXwRTnxN77_pYQQ&dib_tag=se&keywords=ruthex%2Bm3&qid=1713290057&sprefix=ruthex%2Bm3%2Caps%2C71&sr=8-5&th=1

(4)then you will need a soft TPU for the grip I recommend varioshore TPU

https://colorfabb.com/varioshore-tpu-black

(5)and PETG to your liking .

(6)M3 screws of appropriate length

printing advice:

For the holder I recommend using four perimeters.

And for the fixer and shaft I recommend printing solid(the most perimeters possible).

If you chose varioshore TPU for the grip, your temperature speed and infill determine how the grip will feel.

Higher temperature and lower speed make the material softer, the opposite will happen if you do the opposite the infill will affect how the material compresses when you hold it.

Assembly:

See model files for assembly reference.

Slide one bearing on one side of the shaft.

 Then slide the grip on and put a bearing on the other side. 

Slide that in to the side of the holder that is already printed closed with some glue.

 Make sure that the glue doesn't touch the part where the balls of the bearing spin as this will compromise how the shaft will rotate.

Then fix the bearing on the other side with fixer2 and secure the screws in place until they are tight.