<p>Just received my new Ender 3 v2. When using the Auto Home feature, the Y-axis motor drives the bed as far back as possible then the motor grinds for about 10-15 seconds. The Y-axis limit switch is not being depressed and the limit stop is about .5 inches away from the switch. The control unit locks at this point and must be power cycled to regain control. If I manually depress the limit switch then it appears to act normally.</p>
<p>Clearly either the limit switch is way out of adjustment or the bed is not positioned properly. Can this be fixed or should I send it back as defective?</p>

[{'answer_id': 15846, 'author': 'Perry Webb', 'author_id': 15075, 'author_profile': 'https://3dprinting.stackexchange.com/users/15075', 'pm_score': 1, 'selected': False, 'text': '<p>You could still get heat creep with a Bowden tube.  It has different characteristics.  Instead of jamming up in the direct drive, the filament can melt too far upwards into the heat break where it can refreeze and jam.  The characteristic, if you can pull out the filament, is widened filament extending into the heat break.</p>\n<p>See <a href="https://3dprinting.stackexchange.com/questions/15732/air-printing-jamming-midway-through-raft-creation/15738#15738">Air printing/jamming midway through raft creation</a></p>\n<p>and</p>\n<p><a href="https://3dprinting.stackexchange.com/questions/15629/understanding-all-the-ways-to-avoid-heat-creep">What are ways to avoid heat creep?</a></p>\n<p>Adding fans to an enclosure improves the temperature control in the enclosure.</p>\n'}, {'answer_id': 16542, 'author': 'Greenonline', 'author_id': 4762, 'author_profile': 'https://3dprinting.stackexchange.com/users/4762', 'pm_score': 0, 'selected': False, 'text': '<p><em>Answer created from octopus8\'s comments. If octopus8 wants to post their own answer, this wiki answer can be deleted.</em></p>\n<hr />\n<p>185\xa0°C is quite ok for several PLAs I have when printing slow.</p>\n<p>Honestly, I couldn\'t believe that the heat can go up the heatsink and Bowden tube to make extruder frame hot. So maybe your extruder\'s stepper motor is just getting hot heats up all metal elements (or a combination of both)? Did you replace only frame or also the stepper motor? Maybe the voltage is too high? I think voltages might be not calibrated well in factory, because my Z stepper in Ender 3 V2 also is getting really hot since I bought the printer (so far I added radiator, but I plan to regulate this voltage).</p>\n<blockquote>\n<p>The new tension arm is a bit tighter than I had it set on my old, but I can\'t imagine it\'s making enough resistance to overwork the motor without seeing other issues first.</p>\n</blockquote>\n<p>I agree with your judgement. Regarding the voltage: first I am not sure if my copy of v4.2.2 mainboard <a href="https://www.reddit.com/r/ender3/comments/ibqo8s/" rel="nofollow noreferrer">has TMC2208 stepper drivers, or some older HR4988</a>. I would need to determine that first, then find a valid formula for Vref. Actual voltage is tuned using potentiometer next to corner of stepper\'s small radiator. You can <a href="https://marlin.crc.id.au/faq/Ender%203%20V2/#vref" rel="nofollow noreferrer">see here an example of this process</a>. One problem is that Ender 3 V2 has the mainboard accessible from the bottom, so I would need something like garage pit to operate...</p>\n<p>As you can see, it is important to not touch the screwdriver\'s metal bar, and anyhow include your body\'s capacity to this circuit, or you may break things. There are also ceramic screwdrivers - but I already bought two and still my best option is sculpted from 3mm filament. Plastic or ceramic tool will need you to measure voltage separately from turning potentiometer. So the idea of connecting voltmeter to small metal screwdriver is very handy, but you have to be careful to touch only plastic parts.</p>\n'}, {'answer_id': 16543, 'author': 'Greenonline', 'author_id': 4762, 'author_profile': 'https://3dprinting.stackexchange.com/users/4762', 'pm_score': 0, 'selected': False, 'text': '<p><em>Answer taken from <a href="https://3dprinting.stackexchange.com/questions/15843/ender-3-v2-extruder-getting-hot/16542#comment30113_15846">Seradhe\'s comment</a>. If Seradhe posts their own answer, then this wiki answer can be deleted.</em></p>\n<hr />\n<p>Sorry for the long delay, but I wanted to post a follow up to conclude this.</p>\n<p>I printed outside of my enclosure with no problem. Best guess is that the sealed enclosure wasn\'t bleeding off heat very well, and the aluminum feeder (being aluminum) was just soaking up the heat non-stop. Fine for short prints but anything over three hours it would get hot enough to soften the filament. I\'m currently printing housings for some extra PC fans I have and framing in a vent system to keep it from getting too hot in the future</p>\n'}, {'answer_id': 18398, 'author': 'Beek2529', 'author_id': 32023, 'author_profile': 'https://3dprinting.stackexchange.com/users/32023', 'pm_score': 1, 'selected': False, 'text': "<p>I had this problem when I switched to the aluminum dual gear extruder. The spring was too strong and was crushing the filament out of its round shape into more of an oval profile as it fed into the Bowden tube. This caused excess friction in the Bowden tube, which stressed the extruder stepper motor and caused it to heat up, which transferred through to the aluminum dual drive. This in turn softened the filament in the drive and cause it to lose even more shape, increasing the friction in the tube and further stressing the stepper in a self-perpetuating cycle.</p>\n<p>No print lasted more than a couple of hours before the filament jammed in the extruder and I was air printing. The solution was to remove the stronger yellow spring and replace it with the weaker bare metal spring that came with the stock extruder. It's not strong enough to distort the filament and problem solved.</p>\n<p>If you are using the stock extruder then the source of friction maybe somewhere else in the filament feed chain.</p>\n"}]
['https://3dprinting.stackexchange.com/questions/15855', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/27314/']