All posts by Richard Grisafi

Richard Grisafi is a Mechanical Engineering Professional who has designed more than 400 unique products/parts for companies and himself. He has saved more than $50,000 on a single project by creatively redesigning a single product. He spends the majority of his free time learning and educating himself in just about anything. He has volunteered his time to help the environment as well as other charitable causes. He loves nothing more than a good project to challenge his intellect.

Sony Rolly (SEP-30BT/SEP-10BT) Full Repair

Sony Rolly Working

Sony Rolly – Finally Fully Functional

Article by Richard Grisafi

It’s been a while since my last post and I’ve been busy with a new job among other things. I was searching eBay last week and they so nicely suggested that I might be interested in purchasing a Sony Rolly based on my previous searching habits. Well since I noticed the price was less than $600 I figured there was something wrong with it. Sure enough the left wheel motor seemed to be locking up and it was being sold as-is with a current bid at about $200. The seller claimed it played stored music and operated as a Bluetooth speaker just fine. If you’ll remember from my previous Sony Rolly Article,  it was my suspicion that the flash chip was to blame for my Rolly’s failure. My computer was unable to recognize it and tried to “Initialize the disk” every time I connected it. I put a bid on this new Rolly and forgot about it for a few days.

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Replacing the Color Wheel and Lamp of an Optoma HD20 Projector

Optoma HD20

Article by Richard Grisafi

It’s been a while since I did a post. My projector broke several weeks ago and I saw this as a great opportunity to fix it and potentially help others.

So here’s what happened. I was watching TV and heard a loud pop followed by a horrible vibrating noise. The projector remained on and the vibration was so bad it caused the focus wheel to rotate all the way out of focus. I also noticed everything was now devoid of color. Immediately I shut off the projector and unplugged it. I took it down and heard what seemed to be glass rattling around inside. I pulled the lamp out and shook loose several shards of brilliantly colored green glass.

I did some research about the problem and came to the conclusion that the color wheel must have failed because there was no color and horrible noise from an unbalanced wheel spinning. The color wheel is just what it sounds like – a glass wheel which spins rapidly. In this case it’s composed of 6 different color sections. 2 Red, 2 Blue, and 2 Green. I suppose it’s possible that you will have no noise if the entire wheel comes apart or stops rotating but either way you will have no color.

If you live in the US it’s probably best to order the color wheel from a US seller on eBay. I ordered mine on Amazon from a seller in China and it took more than three weeks to get here. I might have saved about $30 but I would have rather just coughed up the money and had my color wheel in three days. You can order from Optoma if they’re willing to sell you one however I can assure you it will cost well over $150.

Since my projector has been nagging me for 6 months about how my lamp is about to fail I took this opportunity to replace the lamp also. Replacing the entire lamp assembly is so easy a child could do it however it’s much more costly than just replacing the bulb. I’m going to replace the bulb anyway because I don’t get scared of things like that.

In this case you will only need a Phillips-head and flat-head screw driver. It wouldn’t hurt to have a pry tool as well. I prefer the iSesamo pry tool but there aren’t that many clips and a projector is typically out of sight so you can substitute with a flat-head screwdriver if you don’t mind a few gouges in the projector case. As always this repair is based on my experience for the Optoma HD20. Please use caution when working with electronics. I’m not responsible for any damage you may cause to yourself or your property. Obviously this will void your warranty however it’s probably long gone anyway since this product was discontinued. Now onto the repair.

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The Top 10 Coolest Things to 3D Print

Richard Grisafi - Sweet 3D Print

Article by Richard Grisafi

I’ve had my Solidoodle 2 for just over a year now. Although I have a few other machines this one is my overall favorite because it’s the most versatile. People often ask me “What can you make with it?” so I figured I’d do a post about the top 10 coolest things I would like to make if I just purchased a 3D Printer.

To make this list the item has to be open, freely available, and able to print on the average 3D printer. While I think it’s fantastic that someone printed a castle out of concrete or real edible cookies, it’s not something you can do with off-the-shelf equipment today. Most if not all of these require other readily available hardware (Screws, threaded rod, electronics) however none require proprietary equipment. All designs are available on Thingiverse

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Sony Rolly (SEP-30BT/SEP-10BT) Partial Teardown

Sony Rolly SEP-10BT

Article by Richard Grisafi

So let’s just say that it’s 2008 and you’re standing in a Sony Store with $350 burning a hole in your pocket. You glance over and see someone playing with an MP3 player that’s dancing and moving around. You think about asking what it’s called but there’s no time. You immediately pull out your wallet to pay the inevitable $75-$100 that you think it costs and then you look at the price tag which is $299.99. (I believe it originally cost $399.99 but there’s no way they were getting that). So if you’re me, you just suck it up and pay anyway while shaking with excitement about all the fun you’re going to have with it.

I took the Sony Rolly home and played with it for a solid two hours. I put it in my jacket pocket and showed everyone who would watch it. I made it dance and play music and I even used its streaming feature from time to time. I want to say after about maybe four to five total hours of usage I had forgotten about it. I went to use it a few months later and it wouldn’t work. Just a blinking orange light is all I got when I tried to make it dance. I connected it to my computer and it asked if I wanted to format the flash drive. The software no longer recognized it. I searched all over for a solution to the problem however it seems that most people don’t share my enthusiasm and didn’t want to light $299 on fire for a cheap thrill. Since I couldn’t find any information about how to disassemble it I figured I’d be the guinea pig and do it myself.

As usual this is based on my experience. Please be careful when working with electronics. I’m not responsible for any damage you may cause to yourself or your property. Obviously this will void your warranty however it’s probably long gone anyway since this product was discontinued several years ago.

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Setup and Maintenance of a 40w Laser Cutter from eBay

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The 40W eBay Chinese K40 Laser Cutter

Article by Richard Grisafi

I’ve had my 40W Laser Cutter for just over three months now and I feel that I’ve got a good grasp on how it operates. Overall this is a good machine but it leaves a lot to be desired and the quality control is certainly lacking. The manual (at least the one I received) is written in poorly translated English and it really just skips over many important functions of the laser cutter. In addition, the pictures in the manual were inaccurate and there were various ports/connections in the manual that just were not on my model. Being that I’m a mechanical engineer who is used to accurate documentation, this is just deplorable.

Try to search online about the” 40W Laser Cutter” , “Chinese laser cutter”, “eBay Laser Cutter” or “K40 Laser Cutter” for information. You might see some reviews or complaints but there is very little information about its operation or maintenance. Understandably, this is going to frustrate people who shelled out a few hundred dollars to purchase this machine so I figured I’d be the one to do a write up and potentially save you some headache from my experience.

I’m writing from my experience only and I’m not responsible for any damage you cause with information you’ve read here or anywhere else. A laser cutter is a powerful and dangerous tool and it’s not a toy. Use it at your own risk. That being said click below to read on.

Continue reading Setup and Maintenance of a 40w Laser Cutter from eBay