Replacing polymer bearings on the X axis on the Mini

General LulzBot Mini
21

Thanks
Have some 8mm hard steel shaft material ordered. I’m not finding a dimensioned drawing for the Mini2 bushings. Am I correct that roller bearings are not available as drop in replacements? Nor would drylin linear slide bearings: IGUS RJZM-01-08 ??
Think the precision itWorks bearings best choice?

22

The Mini 2 shipped with RJMP-01-08. Here is the product page for that bearing.

https://www.igus.com/product/?artnr=RJMP-01-08

If you are going to stick with the IGUS plastic bearing, yes, the RJMP is the best choice. The RJM series fits the rod much looser.

RJMP ID- Tolerance +0.000 +0.040 mm
RJM ID- Tolerance +0.025 +0.061 mm

The BOM for Mini 2 is here: http://download.lulzbot.com/Mini/2.0.6/production_docs/

23

I had to replace my carriage with Biolumo’s version to fit the LM8UU ball bearings. I don’t think there are drop-in replacement ball bearings available.

24

Comparing the specs of a LM8UU to the RJMP-01-08, the outer diameter is 1mm larger on the RJMP.

25

Thanks for all the responses.
So, with a Mini 2 from earliest production run, seems I’m supposed to have the precision bushings. I cleaned the rods thoroughly with alcohol and still had groaning. So, have applied a drop of Tri-Flow and groaning no more.

26

I made a step by step video on how to replace the X axis toolhead bearings. Enjoy.