<p>I have a Prusa i3 MK3 or maybe it was upgraded to a i3 MK3S.</p>
<p>How can I figure out?</p>
<p>The <a href="https://shop.prusa3d.com/en/original-prusa-i3-mk3s/1390-original-prusa-i3-mk3-to-mk3s-upgrade-kit.html" rel="nofollow noreferrer">description of the upgrade kit</a> talks about</p>
<ul>
<li>the SuperPINDA (how is it different from the old one?)</li>
<li>a number of small changes (which?)</li>
<li>improved plastic parts (which parts, how are they different?)</li>
<li>metal clips (where to look for them?)</li>
<li>a number of minor changes to the extruder plastic parts (which ones, before and after?)</li>
</ul>
<p>I'd like to figure that out without taking the printer apart.</p>

[{'answer_id': 16726, 'author': 'Thomas Weller', 'author_id': 1570, 'author_profile': 'https://3dprinting.stackexchange.com/users/1570', 'pm_score': 3, 'selected': True, 'text': '<p><a href="https://i.stack.imgur.com/1ldX4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1ldX4.png" alt="Left right" /></a></p>\n<p><a href="https://i.stack.imgur.com/TtrmF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TtrmF.png" alt="Filament sensors" /></a></p>\n<p>The MK3 has 4 pins on the filament sensor, the MK3S has only 3 pins. While you need to take the extruder apart to see that, you can also have a look at the cable instead:</p>\n<p><a href="https://i.stack.imgur.com/5C6JE.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5C6JE.png" alt="Filament sensor cable" /></a></p>\n<p>Matching the sensor, the MK3 has a 4 strand wire including blue and the MK3S has a 3 strand cable without blue.</p>\n<p><a href="https://i.stack.imgur.com/nuCqp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/nuCqp.png" alt="Bearing clips" /></a></p>\n<p>Looking under the heatbed, you\'ll find the MK3 bearings are fixed with U-bolts while the MK3S has broader bearing clips.</p>\n'}, {'answer_id': 20198, 'author': '3DCoded', 'author_id': 35508, 'author_profile': 'https://3dprinting.stackexchange.com/users/35508', 'pm_score': 2, 'selected': False, 'text': '<p>On the LCD, the MK3 will show <strong>Original Prusa MK3 OK</strong>, while the MK3S/+ will show <strong>Original Prusa MK3S OK</strong></p>\n'}]
['https://3dprinting.stackexchange.com/questions/16725', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/1570/']