I received my printer on 6/24 and went to work on it a couple days later. Thus far I've printed exactly one successful part. Missing parts. Bad hotend had to be replaced. Flaky firmware. After finding a good firmware build and working with it on and off for a couple days, I've solved most of my calibration issues. That is to say I can click PRINT and after a normal pre-print procedure, the nozzle goes to where it should be and by all appearances behaves as it should when it gets there. Unfortunately, the nozzle is dry. No matter what I try, I can't get the printer to successfully extrude, at least not more than a few minutes at a time. The filament constantly got stuck in the Bowden tube. When OB replaced my hotend, they sent a new PTFE tube. Same thing. The filament constantly stuck in the tube. This is good Hatchbox filament that printed perfectly in my old printer. I bought 3mm ID / 4mm OD PTFE tubing to ease the binding. It solved the binding problem but hasn't mattered one bit in the big scheme. Now, no matter what I do, the Bowden tube pushes out of the fitting where it connects to the filament drive. I've even gone as far as mounting a vertical piece of perforated metal strip shortly to the right of the filament drive, and affixing the Bowden tube to the metal strip via a cable clamp. The cable clamp doesn't hold. The only thing I know to try now is to try to construct a metal Bowden tube from the filament drive and minimize the travel necessary through a plastic Bowden tube. Does anyone know the size and threads of the output fitting on the filament drive? I'm frustrated to the point of madness. $1300 and literally a month of wasting an inordinate amount of time, and still can't print. This is absolutely one of the worst buys I've ever made.