I understand the bristles are nylon.  I use the same brush to clean my Hobbs.  I know from experience from trying the exact same thing.  It will wear the Hobb fairly quickly if left in contact.  Most importantly though, if running correctly it simply shouldn’t be needed.  Tighten that tension arm till the spring is almost totally compressed.  At that point if you are still shredding your filament you might want to consider a higher temperature.

Gotcha. Thanks for the heads up on that.

The brush looks like metal in the picture, but the bristles are plastic. It also swings out of the way when not needed.

For reference https://www.printitindustries.com/colle … 6-extruder

heartless wrote:

n2ri wrote:

so does anyone have or know where I can get a full surface bed heater like the Silicone one made couple years ago for my SD6 6"x6" NOT 8"x8" like SD3/4 use. a member on here had 1-2 they didnt use for reasonable price about a year ago.

starting to look like between $100-$200 to get the rest of parts needed to do all the Upgrades on My SD2 wasnt there a maker-forge clone dual extruder 3D printer for like $300-$400? would that be a better option or just different parts needing upgraded.

the SD3/4 bed heater is only 6-1/4" square - it had the same problem with cold edges that you are experiencing.

tell ya what - i have a complete SD4 bed that I pulled out of one of my machines when upgrading - complete with wiring, thermistor, insulation, the whole works - to my knowledge it is still very functional.
you pay for the shipping and it is yours to do with as you please. Pull it apart and try to fit the silicone pad to yours, or whatever.
Flat rate Priority Mail padded envelope is $7.55

thanks again for this!
now just gotta figure how to unglue it and see if there is spots for the 3 SD2 mounting screws to go through heat pad as the SD3/4 holes are not the same spots. otherwise I just get a thermister and insulation to use on a dif heater or maybe the Geetech mini PCB htr

You really should avoid Geetech products. The only thing they are good for is teaching QC inspectors what not to pass. Their products are made with inferior parts and inferior labor. In short Geetech products are just garbage and will fail most of the time out of the box.

n2ri wrote:

so does anyone have or know where I can get a full surface bed heater like the Silicone one made couple years ago for my SD6 6"x6" NOT 8"x8" like SD3/4 use. a member on here had 1-2 they didnt use for reasonable price about a year ago.

starting to look like between $100-$200 to get the rest of parts needed to do all the Upgrades on My SD2 wasnt there a maker-forge clone dual extruder 3D printer for like $300-$400? would that be a better option or just different parts needing upgraded.

the SD3/4 bed heater is only 6-1/4" square - it had the same problem with cold edges that you are experiencing.

tell ya what - i have a complete SD4 bed that I pulled out of one of my machines when upgrading - complete with wiring, thermistor, insulation, the whole works - to my knowledge it is still very functional.
you pay for the shipping and it is yours to do with as you please. Pull it apart and try to fit the silicone pad to yours, or whatever.
Flat rate Priority Mail padded envelope is $7.55

thanks again for this!
now just gotta figure how to unglue it and see if there is spots for the 3 SD2 mounting screws to go through heat pad as the SD3/4 holes are not the same spots. otherwise I just get a thermister and insulation to use on a dif heater or maybe the Geetech mini PCB htr

n2ri wrote:

wardjr wrote:

print a replacement

how did you take that photo? theres like an inch behind it then solid metal wall on SD printers

You are aware that the entire gantry, along with the extruder moves?  I simply pulled it towards the front of the machine.  I also find it rather strange that you would have the only SD I have seen (and I’ve seen more than most) that uses anything other than a 40mm fan on the extruder motor.

DOH! yeah of coarse, LOL. yeah now I see it is 40mm just didnt seem like it before. thanks. that makes it easier to replace/fix.

wardjr wrote:

print a replacement

how did you take that photo? theres like an inch behind it then solid metal wall on SD printers

You are aware that the entire gantry, along with the extruder moves?  I simply pulled it towards the front of the machine.  I also find it rather strange that you would have the only SD I have seen (and I’ve seen more than most) that uses anything other than a 40mm fan on the extruder motor.

print a replacement

how did you take that photo? theres like an inch behind it then solid metal wall on SD printers

fans are available in many sizes and voltages

it should be a standard 12volt fan what size does the sd2 use.

i am guessing 40mm x 10  a fairly common size for 3d printers as these a match the holes in a nema 17 motor.

if this is the case just about any electronics store or 3d print supplier, take your pick. look for the ball bearing style notua seems to be the go to premium brand.

this fan is half normal size for some reason and blows on an aluminum finned heat sink. cant get good look at it without mirror or un installing the carriage. My Brother inlaw stuck his big finger in it when I just bought it and told Him NO DONT! too late, its been wheezing ever since adults are worse than kids seems