RE: Details required about Envision Perfactory

From: John Kerr <>
Date: Mon Jan 12 2004 - 14:46:38 EET

Dear 3D Systems Guys,
Take this challenge please. He is talking without knowing what Viper can do ? He forgets bangles, pendents, are also part of jewellery. Now I ask for live benchmarking to prove these figures.
Martin, your facts will be replied with results after our trials. Note we are talking of ring height of 30mm or more.

Martin Forth <> wrote:

v\:* {behavior:url(#default#VML);}o\:* {behavior:url(#default#VML);}w\:* {behavior:url(#default#VML);}.shape {behavior:url(#default#VML);}st1\:*{behavior:url(#default#ieooui) }


Thank you for your reply maybe I can put in my “two cents” with regard to build speeds etc


In Europe and Asia we have sold many systems into the Jewelry industry and have perhaps a little bit more experience in Ring manufacture than my USA colleagues.


We build between 8-12 rings (actual no. depends on width of rings) on the Mini system, depending upon layer thickness this takes anything between 3 hours and 4.5 Hours (50 and 25 micron respectively)


As a former Director of 3D Systems Europe I can vouch for the Viper performance personally, the Viper can build approx 60 rings on one platform in approx 30 hours


Given that we build an average of 10 rings in 3.5 hours we can achieve a throughput of approx. 85 rings in the same period that the Viper takes to build 60.


The Viper only has a “sweet spot” for high resolution build styles in a 100mm square area in the centre of the vat. The beam loses resolution when the angle and length of beam is increased outside of this area (basically the spot gets bigger).


This means the Viper can only build outside of the area in 50 micron layers and the spot size in nearer 0.1 mm so if you are building 60 rings the resolution of the rings becomes nearer 50x100 micron (25micron layers only available in “sweet spot”) compared to 20x32micron on the Perfactory on full build envelope.


As my colleague already mentioned coupled with ongoing laser costs ($40K) and maintenance costs ($15K) the Perfactory offers significant cost performance ratio advantage over Viper.


Hope this helps clarify some points for you


Martin Forth

Vice President European & Asia Sales

Envisiontec GmbH

Litton House

52-56 Buckingham Street


Bucks HP20 2LL

United Kingdom

Tel 0044 1296 611418

Fax 0044 1296 397829

Mobile 0044 791 957 6282


-----Original Message-----
From: John Kerr []
Sent: 10 January 2004 08:27
Subject: Re: Details required about Envision Perfactory


Dear Friend,


You can write to me personally as well, should not be afraid.


Your email info is perfect, nicely mentioned the technology behind the Envisiontec. My impression about mask type exposure was based on the description written in the envisiontec website. They wrote there. There is nobody can see what is happening inside the machine when the Perfactory runs.


You info is in-complete without the build speeds of Perfactory Mini in different resolution in 0.025 layers. You also have some mis information about Viper system. I am doing my initial tests with Perfactory capabilities for jewellery applications & my initial study is not so much satisfactory as regards to the claims by Steven, Mr. Shah.


You mentioned all the disadvantages of Viper while forgot to mention the build speeds in terms of number of parts per day from Viper. Just remember the whole discussion started from my email about the build speeds comparison. I would appreciate if you can reply to my first mail on the list about speeds. Or I will give you data in week's time, which will be definitely un-biased. As i do not sell Viper nor Envision, but I am purely RP enthusists.


Johnn. wrote:

Dear all RP Users:
As I am involved with EnvisionTEC in the USA, I would like to clear up some of the confusion you have seen from a technical standpoint on the Perfactory MINI system from EnvisionTEC.

The purpose of this email is not to personally respond to Mr. John Kerr.

The Perfactory Mini Multi Lens system from EnvisionTEC is based on Texas Instruments DLP technology. Simply put, a MEMS chip reflects an image off 1.5 million mirrors through an optical engine into the surface of the resin to be cured.
The MINIMUM average life of the DLP chip is 25,000 hours.
The system uses a visible light projector bulb to cure the resin and therefore no UV rlaser or jetting tecnologies are involved.
The Final projection lens on the perfactory can be changed like changing the telescopic lens on you camera.
The number of rings you can build depends on the lens system you use and the accuracy you require in X and Y besides the size of the rings.( lens F60:79x63mm, or lens F75: 55 x 44 mm, or lens F85: 42 x 34 mm working envelope)

The rings produced require no post curing and are ready for use.

On comparing the VIPER to MINI, I note the following:
1-The list price of the Viper is $179,900.00 versus $59,900.00 for the Perfactory.
2- The light bulb lasts an average of 850 hours and is user replaced at $1 per hour, while the laser is $4 to 6 per hour requiring technician replacement installation ($35,000.00 for laser head and diode pack).
3- NO maintenance contract for the Perfactory is needed after the first year, while the service contract for the viper is around $30,000.00 on the average, and if you do not have it, you will pay $30,000.00 for the laser when it goes down.
4- The perfactory is calibrated in 7 minutes by the operator, while the laser beam roundness and moving the spot on the laser crystal to increase the power at the VAT requires a 3D technician.
5- You require a minimum of 40 KG of material to fill the VAT to build your first ring, while you require 300 grams of Material to build your first ring on the MINI
6- Both Systems can build high quality parts, and the maximum build envelope using the lens F=60mm is 79mm x 63mm in x and y
7- The MINI system can build slices down to 20 microns in Z, and you can switch between materials in less than 5 minutes.

Finally, it is possible to do nesting for simple rings by simply placing spruces on the rings base and running the spruces up to the platform, but because of the build speed and possibility to send multiple jobs to machine, and ease of taking old job and starting next one (2 to 3 minutes), there is no advantage to nesting in the Z direction.


Wyle Mansour
Application Engineer
EnvisionTEC , Inc

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Received on Mon Jan 12 14:32:35 2004

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