Re: Solidoodle stock rods not useable with linear bearings
I found the stock rods felt like the linear bearings were rolling on sandpaper. Same bearings roll nice and smooth on stainless 8MM rod, only downside I can see is eventually the bearings can carve grooves in the rods if they aren't hardened or there is too much tension pulling the bearing towards the rod.
Similar issues with fitting bearings to the y carriage 6mm drive rod, I wound up having to turn the ends of the rods in a metal lathe to get a proper fit.
Replacement carriages, very loose fit to the LM8UU bearings regardless of what I did in the printing process. First go-round I "fixed" the problem with a couple wraps of Kapton on the bearing shell. Still they loosened up after a while as well as the carriages themselves didn't prove to be as durable as I need for the amount of use my printer gets. Specifically the portion where the X carriage drive motor mounts would deteriorate fairly rapidly causing the motor to lean inwards letting the belt loosen. The final fix was a complete blank screen redraw of the carriages to fix the loose bearings and strengthen the motor mounting as well as conversion of the entire printer to bearings on all shafts. I also added a couple MM to the backside of the carriages to strengthen the bearing seats as well as adding captive nuts to allow locking screws to be used to hold the 8mm rods solidly in place. Along with that fix I installed a fan on the X carriage stepper, the reduction in heat also helps the longevity of the mount on the carriage block. I considered putting a fan on the Y stepper as well but as it mounts directly to the metal frame it heatsinks through that path fairly well.
Also did a complete redraw of the extruder block to make it more E3D friendly, new idler blocks to convert to bearings and replaced the belts with GT2 and all pulleys from 18 tooth MXL to 16 tooth GT2.
End result of all the mods is much tighter tolerances on prints with 100% repeatability. Considering I often run the SD3 8 to 10 hours a day, 5 or 6 days in a row I'm quite pleased with the more consistent performance.
One more note, Folger Tech, aka New Hampshire ebay seller, I bought a large portion of the gear to build my 3DR delta from him and got outstanding customer service. The order was placed a bit before Christmas and it appeared the USPS lost the shipment as the tracking went dead cold after it left the sorting facility, seller reshipped the entire thing after it hadn't updated in 4 days without question. Eventually it did wind up arriving after opening an inquiry with the PO, I just paid the seller for the additional parts rather than send them back, I can always find a use for them...