Bulldog XL Spares
Posted by grezmel
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Re: Bulldog XL Spares February 17, 2015 07:33AM |
If you have tools you could just redrill and tap the holes for larger screws. It's only aluminum- in some respects it's easier to work that wood. Otherwise, I'd go right to the source- reprapdiscount.com
You must have put some serious torque on the screws!
Have you had a need to take the extruder apart frequently? I ask because I have a BullDog XL and been using it for the last two months and it has been 100% reliable so far. I've been using it to push 1.75mm filament...
The mounting holes in the foot for bolting the extruder to the carriage were a little small for my taste, but I found that I could tap them with a 6-32 tap without drilling them out. The threads are a little shallow, so if they ever strip I'll drill them and tap for #8 or #10 screws. It's very nice to just turn two screws to release the extruder from the carriage!
Edited 2 time(s). Last edit at 02/17/2015 07:43AM by the_digital_dentist.
You must have put some serious torque on the screws!
Have you had a need to take the extruder apart frequently? I ask because I have a BullDog XL and been using it for the last two months and it has been 100% reliable so far. I've been using it to push 1.75mm filament...
The mounting holes in the foot for bolting the extruder to the carriage were a little small for my taste, but I found that I could tap them with a 6-32 tap without drilling them out. The threads are a little shallow, so if they ever strip I'll drill them and tap for #8 or #10 screws. It's very nice to just turn two screws to release the extruder from the carriage!
Edited 2 time(s). Last edit at 02/17/2015 07:43AM by the_digital_dentist.
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Re: Bulldog XL Spares February 18, 2015 03:39PM |
Quote
the_digital_dentist
Is there some documentation in it that I don't have? I literally don't have ANY documentation on it except for the 1 page sheet I downloaded from RRD that says the motor current should be set to 0.6A.
Nope, I watched a video possibly the original indigogo one when I got mine as it had no documentation, and that's where they explained what the nuts are for. You're slightly better informed than me here as I think mine is set waaay above 0.6A, so I didn't get that memo
Mine has come back to life. Turned out to be a faulty stepper motor driver. Last non silent one on the board, so I think it committed suicide :/
Bit of a relief actually as I took the bulldog apart and I think it might be tricky to replace the stepper motor. The shaft appears to be custom made with the gear box drive gear as part of it. The stepper is slightly shorter than any of the shortest steppers I've got laying around, so not sure what's going on there.
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Re: Bulldog XL Spares May 10, 2015 11:33AM |
Back to the OP's question, I had a similar issue, I was very much not happy with how the hot end was held on by the 2 different sized threaded holes. The smaller one went first, when it did I prolonged it by using a longer screw but that eventually went as well, then I was relying on the larger diameter bolt alone when, it also stripped! I was mad, but it is a crappy design which sucks as the rest of the bulldog xl is amazing except for having to bolt and unbolt the entire thing in order to work on it (clear shredded filament or take off hot end). Anyway for the hotend, after I stripped both bolts I took a generic E3D, cut the top off of it so all I had was about 5 fins of the heatsink and it was threaded all the way through and added not one but 2 of the M6 x 30mm nozzle throat one on top of the other. Here is a couple pictures so you understand:
sorry they are blurry, but I hope you get the picture. The only available way to mount the hotend left was the M6 thread for the throat. Since then I have bought 10 spare throats, some m6 nuts, some ptfe liner and three 6mm taps so I can go on using this configuration for a long time. The other thing I did before this was to add a picatinny rail quick release mount in order to make it one simple thing to remove and install the extruder. I have put it on thingiverse for any who want to download it:
bulldog picatinny mount
I hope this helps. ;-)
sorry they are blurry, but I hope you get the picture. The only available way to mount the hotend left was the M6 thread for the throat. Since then I have bought 10 spare throats, some m6 nuts, some ptfe liner and three 6mm taps so I can go on using this configuration for a long time. The other thing I did before this was to add a picatinny rail quick release mount in order to make it one simple thing to remove and install the extruder. I have put it on thingiverse for any who want to download it:
bulldog picatinny mount
I hope this helps. ;-)
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