I seem to have fared better than many of you, but here is my experience. As you can see, things seem to have improved over the last year, but there is still room for improvement.
I ordered a fully assembled Glider 3D on December 28 2011, together with 2 extra rolls of feedstock. The website indicates that shipping would be "next day". Indeed, the Glider shipped December 29, and so (separately) did one of the rolls of feedstock. Another roll was delayed a few days (no big deal). The UPS tracking number shown in my order was just for the first feedstock, so while I was all excited when the UPS man arrived a few days later, there was no machine there, just the feedstock. The machine was on its way, but I had no way to track it. It took a couple of emails through to the company for me to get the message across that I would like a tracking number for the machine itself, but they did send one to me, and the machine arrived a couple days after the feedstock. Overall, I am happy with the ordering and shipping experience.
The machine appeared to survive the shipping well, but many nuts had vibrated loose. Once again, no big deal, but my suggestion would be for them to torque the nuts a little more, and perhaps also to use a drop of blue loctite. If I were able to communicate with them about technical issues, I would make this suggestion, but as you will read below, the company has been unresponsive to any of my technical questions.
The instructions that came with the Glider 3D are adequate to get printing, but not quite adequate for a successful print, at least not for me. For example, a roll of thin kapton tape was included, but no instruction about how (or where) to apply it. In the end, after some reading, I realized I needed to wrap up my hot end in order for the tip to remain hot enough to extrude ABS (although PLA was fine). My suggestion would be for them to get one of their machines in front of a newbie and watch him/her go through the motions of getting it up and running. Any issues that come up with that should be included in the instructions so that people's first impressions are positive rather than frustrating. Still, once I had wrapped my hot end, I was able to extrude properly. While the experience was needlessly frustrating, after a couple of days of mucking about, I was able to get extrusion to happen properly.
The heated bed that came with my unit only heats up to about 52 celsius -- not hot enough for ABS to stick. No kapton tape (other than the very narrow roll for the hot-end wrapping) was included, and it seems ABS doesn't stick well to aluminum, so my printing was largely unsuccessful as a result of the print not sticking to the bed. In the end, I experimented with a variety of other bed materials, and ordered a wide roll of kapton tape, which helped a lot. While waiting for the kapton, I printed on 600 grit wet-n-dry sandpaper, which worked "ok". The biggest problem was that the bed only reached 52 C. It has 4 one Ohm resisters in series, driven by a 12 volt power supply (that came with the system). Set up like this, about 3 amps x 12 volts are being used as heat, or about 36 watts. I believe I need to double the energy input (or perhaps more) in order to achieve temperatures suitable for ABS (85 - 130 or thereabouts). I have ordered an adjustable 0 - 30 volt 5A power supply on eBay, and that should let me experiment with energy input. I have also ordered some additional resistors from digikey, for the same reason. I am not sure why the botmill.com bed is so anemic. Why would they send out a bed that doesn't work for ABS, and that is marginal for PLA? Perhaps another approach to this would be to insulate the underneath of the bed, halving the radiant surface area. No such insulation was included, so half the heat input is being radiated off the bottom of the unit. Either way, the heated bed is not adequate as supplied, but is fixable with relatively little effort.
I was pleased with the quality of the Glider's motors, electronics, and parts. The unit came with Kysan 1124090 steppers, and the Kobbels Engineering Gen6 electronics, all of which worked fine. There is an issue with the Gen6 electronics, in that a ripple in the power supply causes the steppers to whine. While it didn't bother me too much, my wife objected to the noise. Some Internet reading showed up that the addition of a 1 nanofarad capacitor across R12 helped significantly with the ripple, and therefore the noise. I have ordered some from Digikey (not available at the local Radio Shack), and we'll see how it works. I constructed a 2.4 nanofarad capacitor by soldering two 4.8 nf caps in series, and attached it (I used those ones simply because that's what I had laying around, not because they are the right ones, which they are not). The noise dropped in half, so I'm hopeful that the 1nf will do the trick. I noticed that the temperature readings varied a lot, and apparently this is due to the ripple too, so should improve with the 1nf cap. While this small Gen6 issue is not really a botmill.com issue, it will affect every user, and should be addressed (hopefully by Kobbels!).
Another problem with the Gen6 electronics is that it cannot measure or control the bed without resorting to cobbling together connections through the RS485 port. Presumably this will be addressed in a future rev of the board, but it is not yet fixed on the rev I received.
My only ongoing gripe with botmill.com is that they find themselves unable to respond to customer technical questions, at least they've been unable to respond to any of mine for almost a week. I have asked about pricing for buying additional hot-end tips, but have not received a price from Gil. I have asked a series of questions about the hot end, firmware, and so on, and have received no correspondence from the technical support person. Gil forwarded my questions to someone named Shaan last week, indicating that Shaan would answer, but nothing.
The best part about my interactions with the company has been that they timely shipped me a working Glider 3D (Mendel) printer, at a price I considered reasonable. The worst part has been the non-existent after sales support. The other issues about loose nuts, missing tracking numbers, and so on -- these are minor and easily fixable. But if a company won't talk to its own customers, I'm not sure this is a good sign. I hope to be able to report that service improves over the next while, but at the moment, if you order from botmill.com, you should consider that you are "on your own" once the machine arrives. At least, that's how it feels to me. If there had been a true problem with my machine (i.e.: bad electronics, part broken in shipping, and so on), I have no confidence that the company would have been willing to communicate with me on the matter.
Things I would like to talk to the company about, but have been unable to do so (because they don't respond, even though Gil acknowledges that my questions have been asked):
- What firmware is installed on the Gen6 electronics? It does not respond to "M115;" (which should return the firmware capability string). I have downloaded the firmware from the board into my computer, but it contains no strings that identify its origins or version.
- 2 hot-end tips were supposed to be included with the product -- one for 3mm and one for 1.75mm feedstock. Only one tip was included. I'm using it with 3mm feedstock (since that's what came with the machine), but where's the other one.
- I would like to buy some more hot end tips to experiment with hole diameter. How much do they cost?
- What should I be doing to get the bed to warm up to a suitable temperature for ABS?
I would presume these are reasonable questions for someone who has just bought a fully assembled machine. I am optimistic by nature, so remain hopeful that the company will improve its responsiveness. But at the moment, the company's technical support is the weak link in an otherwise pretty good chain.
Let's hope they take every one of the comments on this thread to heart, because I think it would take only a small change in company culture for botmill.com to be a great supplier. But without those changes, the market is left open for a more customer-oriented company to take the business instead.
Dan Freedman