i am Really annoyed with how long it takes to heat the bed. And sometimes it doesnt stay hot.. in addition for some reason sometimes the bed just starts dropping heat and i pretty much have to reset everythign to get it heating again. I have a 12v power supply .. also a spare 24v but it's only 5 amps so that's not helpful and im not spending the $ for a 15 amp(ish) 24v so i had some thoughts. Has anyone done a peltier unit well? i see they have big problems with pid (bangbang is just slower pid) and they degrade if you dont draw off the heat from the cold side so that's sortof out. So i'm thinking.. has anyone tried dual heated beds mounted on top of each other with the thermistor between? Or a peltier mounted on bottom of a heated bed or something (this one isnt well thought out) to assist the bed? I guess i could keep a couple extra sheets of glass laying around but honestly i have enough "stuff" laying around related to my i3. Any ideas? it's ridiculous you have to wait 10-15 minutes for the bed to heat up and that then it BARELY makes it. And of course that last 10 degrees takes 800 years. https://reprap.org/forum/read.php?4,375697,375697#msg-375697 Sat, 12 Sep 2026 22:10:13 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?4,375697,377411#msg-377411 https://reprap.org/forum/read.php?4,375697,377411#msg-377411 cdreid9999 Reprappers Wed, 02 Jul 2014 23:36:54 -0400 https://reprap.org/forum/read.php?4,375697,377168#msg-377168 https://reprap.org/forum/read.php?4,375697,377168#msg-377168 What time do you get now with your improvement ?
Ha det gött
Bosse]]> sidhabo Reprappers Wed, 02 Jul 2014 10:24:52 -0400 https://reprap.org/forum/read.php?4,375697,376977#msg-376977 https://reprap.org/forum/read.php?4,375697,376977#msg-376977 I cheated and turned it up to 17v when i remembered my voltage regulator was blown and thus unlikely to hurt anything. Works fantastic.. bed heats up fast now and holds temp with no problem. Bonus of course are that the fans turn faster and the steppers should in theory be capable of 25% more speed. Now that that's sorted time to work on extrusion rate, clogging and maybe upgrade to nema23 steppers]]> cdreid9999 Reprappers Wed, 02 Jul 2014 01:03:32 -0400 https://reprap.org/forum/read.php?4,375697,375975#msg-375975 https://reprap.org/forum/read.php?4,375697,375975#msg-375975 ckambiselis Reprappers Sun, 29 Jun 2014 14:57:56 -0400 https://reprap.org/forum/read.php?4,375697,375962#msg-375962 https://reprap.org/forum/read.php?4,375697,375962#msg-375962 cdreid9999 Reprappers Sun, 29 Jun 2014 14:35:51 -0400 https://reprap.org/forum/read.php?4,375697,375708#msg-375708 https://reprap.org/forum/read.php?4,375697,375708#msg-375708
If you aren't going to spend the $ to put more watts in, dual heated beds, or anything with more mass and surface area is just going to take longer to heat.

$-wise, you could work on reducing the watts out and insulate the bottom (I think Nophead had good results filling the space below with RSC cardboard) or a temporary insulator on the top. Neither of these will solve the intermittent dropping heat problem.]]> DaveX Reprappers Sat, 28 Jun 2014 22:13:39 -0400 https://reprap.org/forum/read.php?4,375697,375697#msg-375697 https://reprap.org/forum/read.php?4,375697,375697#msg-375697
Has anyone done a peltier unit well? i see they have big problems with pid (bangbang is just slower pid) and they degrade if you dont draw off the heat from the cold side so that's sortof out.

So i'm thinking.. has anyone tried dual heated beds mounted on top of each other with the thermistor between? Or a peltier mounted on bottom of a heated bed or something (this one isnt well thought out) to assist the bed? I guess i could keep a couple extra sheets of glass laying around but honestly i have enough "stuff" laying around related to my i3. Any ideas? it's ridiculous you have to wait 10-15 minutes for the bed to heat up and that then it BARELY makes it. And of course that last 10 degrees takes 800 years.]]> cdreid9999 Reprappers Sat, 28 Jun 2014 20:34:25 -0400