Inserting Rods into X-end-idler and X-end Motor
Hi all,
So was assembling my printer today, and got to step 7 of the x-axis assembly. Right off the bat, I noticed that the rods were a VERY VERY VERY snug fit, and after fussing with them for about 10 min trying to get them to seat, the printed parts both split. I have requested new parts (as I do not have a printer to print new ones myself). Anyone have any suggestions to ensure that this does not occur again? (I was stunned by this btw, as everything else was going so very smooth!).
-J
Re: Inserting Rods into X-end-idler and X-end Motor
When building my printer, the rods were a tight fit, but I did not have to use a hammer; it was all about properly aligning them before applying force to push them in. Once I had them aligned and started at both sides (four points inserted), they went in with a bit of muscle power and wiggling/twisting.
The pain came when I had to remove them to replace the bearings. Even then nothing broke. Why did I replace bearings? They will wear out very fast unless they are greased before installation.
But these are printed parts, and as such a lot of things can cause a part to be undersized. A new spool of slightly damp filament is one. Maybe you were just unlucky and got that set of one in a thousand parts.
Re: Inserting Rods into X-end-idler and X-end Motor
Yep. alignment is key. If you are off at an angle, the edge of the rod will dig into the plastic and make a burr which will make it even harder to get it to slide home. If it's not going in... Check for a burr and if there is one use a small knife to carefully trim it before trying again.
Re: Inserting Rods into X-end-idler and X-end Motor
One of mine was too tight, as well. Worse even, I realized it was gonna be an issue when it was half way in, and getting it out again was just as difficult.
I ended up filing inside the hole just a little to smooth it out, as a tiny speck of plastic can hold up the rod. After that it was way easier to get it in.
Re: Inserting Rods into X-end-idler and X-end Motor
Ream out the holes with a standard 8mm drill bit. Do it very slowly in a power drill or do it by hand. The smooth rods will then fit correctly and will be easy to insert fully with a little effort. Definitely never use a hammer to fit them - make sure the holes are the right size with a drill.
Re: Inserting Rods into X-end-idler and X-end Motor
You don't even need a drill bit. Use one of the rods themselves.
Chuck up one rod o your variable speed drill. Run it in/out of each hole to full depth. That will reform the holes just right amount to permit easy assembly yet be snug.
RE: Inserting Rods into X-end-idler and X-end Motor
I'm guessing this is because of printed parts.
I started assembling it today and the motor side snapped. I hope I will get better fitting parts. And soon.