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8mm Linear Bushing (LM8UU/LM8LUU) Various tolerance

by chekcian Jan 24, 2018
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I have the original bearings on my printer and have not used any made from plastic. Therefore, I have a Question or 2 on these bushings. I have stainless steel rods on my Anet A6 so how tight should these be? The diameter i have is exactly 8mm. The smallest one you have is 8.2mm and will slop on the carriage rod.

It all depends on your printer tolerance. You can experiment by printing all the available tolerant in one print and try out which tolerant suit you best as the tolerance numbers are embedded in the print itself. You can compare the play between 3d printed bushing with your existing steel bearing. Most important thing to look out for is make sure it does not bind as it glides. Ideally it should glide on its own by gravity

Ty, I know measuring the rods I have the diameter is only 7.99mm - 8mm on the max side. so do you think the 8.20mm will be too lose? That seems to me that ,20mm would cause a bad print? I plan on making the bearings out of carbon fiber filament.

Trust me, if your guide rod is measure around 8mm and you have an extremely dimensional accurate 3d printer like original PRUSA i3 Mk3. 8.2mm tolerance bushing will probably be still too tight and your stepper will skip steps as the bushing will behave like being stuck on the rod with no room to move. I am currently using around 8.32mm which mean there is a slight tolerance of around .16mm between the rod and the bushing that give the space for the bushing to glide smoothly. The greatest advantage of printed bushing is lighter and very quiet just like Igus bushing. Even the bushing is printed in PLA it last a long time on steel rod. The wear are mostly seen on carbon fibre guide rod. Most printed bushing on thingiverse I used before will just eat up the carbon fibre rod like making groove line on the carbon rod. That is why Igus has different bushing for carbon rod