After the first layer my Monoprice mini stops printing and gets jammed. It has only printed a full thing once. The last 6 times I have printed it stops and gets jammed. Every time I unjam it the tube connector has to be ripped off, I then have to put a new one on. Does anyone no how to fix this. I am using BAMtack filament.
Are you referring to the short plastic tube before the hot end and after the brass fitting? I found that the plastic tube was too wide and the filament would coil up in it. I think it is a design flaw. I made my own fitting to fix the problem. I took a section of 10-24 threaded rod and bored a hole slightly larger than 1.75 mm (the filament diameter) through the center. I think the length of threaded rod was about an inch and a half. I inserted the rod in place of the plastic tube. I tightened it in using the little Allen head screw that tightened the brass fitting. I then put a 10-24 couple nut on the rod all the way down to the heat sink. This then left enough threads in the couple nut to tighten the brass fitting in. I believe that the brass fitting is a different thread size but it works well enough. I haven’t had an issue with jamming since I did this.
Mono price does offer a one year warranty on all their products. You could always just exchange it for a new one.
I worked with them through my own jamming issues and they did not have a solution. It seems to be a design issue not a quality issue. If you were to get another machine I think you might have the same issue.
What do you mean the tube connector has to be ripped off and replace? Jammed in what way?
Head over the Monoprice Mini Facebook group. There’s tons of information and tips, and more importantly, lots of people using the same machine and helping each other out.
Thanks! It is the brass connector right above that plastic piece where it coils and jams do you have any idea
Dumb question but is this properly leveled?
If you raise it up on the X-axis and heat it up, can you extrude filament with no issues?
there is a very helpful FB group that responds in near-real-time, try asking there 
I took apart mine and found I have the same problem do you have any other ideas besides the metal rod?I don’t have a drill press to drill through it and don’t want to with a hand drill.
This is a tough one. I looked at mine and found that I actually used 1/4-20 threaded rod and a 1/4-20 coupler nut. I bored mine out on a lathe. I looked on McMasterCarr to see if they had anything but all I found was this McMaster-Carr It is a little expensive and the ID is too large.
I had another thought, I found this: McMaster-Carr. It might be a simpler upgrade for the plastic tube that the Monoprice comes with. You might need to experiment with different sizes. I don’t remember what the length of the Monoprice plastic tube was but I think that the ID is better. You might need to chamfer the top of the ID to help guide the filament through.
This printer does not work well with brittle filament. When the extruder homes in the tube is kinked in a way that snaps the filament (its by design… move the extruder all the way to the left the tube makes an s shape). If you bend the filament ~110 degrees and it snaps try a more flexible filament (cheaper ones may work too)
Thanks that is very helpful!
