My leadscrew nuts had started to exhibit significant wear. Bambu has provided me with an official leadscrews/nuts replacement but I didn’t feel like spending several hours, perform a major disassembly and re-assembly to install it and with the risk that it had to be redone in the future.
Instead I came up with a quick fix that takes less than 8 minutes per leadscrew and requires absolutely no removal, not even to switch the printer off (in fact it’s required to keep it on ).
You can choose to use it as an interim fix until bambu ship you the replacement kit or use it as a permanent solution (my choice as they are now so easy to replace, I don’t care if I have to do it more often that the original brass nut although I’m not sure it will be the case).
I only used the printer for about 20hrs after replacement but I simulated about 300hrs of use with an accelerated wear gcode and the nuts show no sign of wear.
I was going to say, if you’re gonna sell them you really should use i190, the goal really needs to be achieving what these nuts should have had in the first place - lifetime durability.
You shouldn’t have asked me so I had to do it… I couldn’t wait and replaced my front 2 nuts with igus i190, I left the ASA nut on the rear though because I really want to see how long it lasts. It took only 15 minutes to replace the 2 nuts but certainly more to wipe clean my 2 leadscrews so that no lubricant was left which is how the igus nuts should operate. I’ve never seen my leadscrews so shiny before . Not having to clean and lubricate those leadscrews ever again will be a huge benefit. I just hope they’re really good stainless, I would hate to see rust…
Ok so this thread has me very excited! As someone with many failed H2D’s and a few H2C’s with massive lead screw nut play and several replacements so far I am hyped!
My question, where can I get igus i190 at half rolls? I dont need no $100 spool lol
That’s the problem, where are you located? Don’t buy the new i190PF if your country still stock the i190, it’s cheaper. PF variant was developped to get rid of PTFE and find an alternate but old version should be better and cheaper. I know it’s cheaper in Germany and may be other places but you’re right, it’s about €100/$100 with VAT and shipping for a 750g roll in most countries!
That’s what I paid for it but my plan was also to reproduce several nuts for my mill and lathe
Edit: Igus proposes free samples. Others have complained that the samples had big variations in diameter and they had clogged nozzle because of it but you can start with requesting one and see how it goes. Not sure of the length of the filament they provide as samples though
You can request a 25g sample on their website - the rep who contacted me was pretty cool and he had two sent out for me, even. One should easily be enough material to make a set of nuts from!
It’s 25 grams per sample. I haven’t opened the two I got yet, but I’m guessing around 10 meters/yards in the pace. They look pretty consistent and accurate to 1.75mm using my high precision eyeball.
I don’t know what happened but after a couple of hours of use, I have backlash with my igus nut where the ASA nuts did not. I have to look into it more but may be I need to anneal the igus which I did not. For now, it seems the ASA nuts are better
Replying to my issue… It appears that the igus i190 is a lot less stiff that I hoped. It can deform easily under high load. It will be OK for the thread I suppose as the load is light but screwing a little tight has deformed the face and as a consequence, slighty tilted both half-nuts opening the joint a bit and increasing backlash.
A whole nut installed the bambu way will certainly be OK but one solution I’m pursuing now is to use the original nut as a base to screw the half-nuts on, it only take to use M3 screws instead of BT3. The added benefit will be to make sure the holes are aligned.
Edit: modifying the half-nuts and using the original nut as the below fixing plate worked. I was afraid as my front nut is just slightly worn that fixing 2 nuts together would jam them if the measurements or the resulting print were not 100% accurate but it worked flawlessly. Let’s see now how long it lasts without developing backlash.
For those tempted to purchase Igus i190 filament, I advise to hold on on it. My ASA nut on the rear is still OK but as soon as I replaced my ASA fronts with i190, they started to develop some slight play after 5hrs of use! I reprinted and annealed them, per igus lab report it doubles the stiffness. One is installed now to compare and hopefully it solves it, we’ll see
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