 |
Material: 308L Stainless Slot Cut: .010" slotting saw Price: $200-$400 Spot size: 100um - 250um Hand tooled by Bill Sabala at the Stanford MechE department. This variety of tip was the mainstay of our printing operation for the last two years. All of our published arrays 1996-1997, including the yeast genome, were printed with this type of tip. |
 |
Material: 308L Stainless Slot Cut: .010" slotting saw Price: really expensive Spot size: 100um - 250um Another Sabala Special. This tip is adjustable via two opposing set screws. (Visibile on the top side). This allowed the tip to be opened and closed down at will. Beautiful work, but too labor intensive to produce in quantity. |
 |
Material: Titanium Slot Cut: 0.008" EDM wire Price: Unknown, provided by N.Mace. Spot size: big When working with this sort of metal, it is difficult to obtain the correct slot geometry. (Narrow at the point) |
 |
Material: 308L stainless Slot Cut: 0.010" by grinding wheel Price: $50 Spot size: Unpredictable The steep angle used in this tip made for a very delicate point, prone to damage. The slot size, being large, yielded variable results. |
 |
Material: 308L stainless Slot Cut: EDM wire Price: unknown Spot size: Unpredictable The large cut out of this tip results in totally unpredictable spotting behavior. This tip had no chance of working. |
 |
Material: 308L stainless Slot Cut: 0.008" by laser Price: unknown Spot size: Unpredictable The slot size, being large, yielded variable results. |
 |
Material: 308L stainless Slot Cut: 0.0015" by EDM wire Price: $80 Spot size: 50um - 120um Extremely small, consistent spots. Somewhat prone to clogging. This tip was Revision A, made by Majer Precision. Slight overburn near the point. |
 |
Material: 308L stainless Slot Cut: 0.0015" by EDM wire Price: $80 Spot size: 50um - 120um Extremely small, consistent spots. This tip was Revision C, made by Majer Precision, and features a no-spin design. (requires a special holder) |
 |
Material: Tungsten Carbide Slot Cut: 0.001" by EDM wire Price: $100 Spot size: really small Extremely small spots, but the tungsten carbide is suseptible to shattering, especially at the tip. In addition, the overburn near the tip causes most of the liquid to stay at the top of the slot, instead of near the point. |
 |
Material: 420 Stainless Steel Slot Cut: 0.006" by EDM wire Price: $30 Spot size: 150um - 200um A nice tip, but very suseptible to rust. Not a good thing for printing DNA resuspended in high salt solution. |
 |
Material: 308 Stainless Steel Slot Cut: 0.015" grinding wheel Price: $30 Spot size: 150um - 200um Difficult to reproduce copies with perfectly centered slots. The tip ends are bent together after cutting. This process is prone to variablity. |
 |
Material: 308 Stainless Steel Slot Cut: 0.010" grinding wheel Price: $30 Spot size: 150um - 200um Shallow angle of this tip resulted in messy spotting characteristics. |
 |
Material: 308 Stainless Steel Slot Cut: 0.015" grinding wheel Price: $30 Spot size: 200um - 250um Difficult to make centered slots. Steep angle, and variable bending cause unpredictable behavior. |
 |
Material: 308 Stainless Steel Slot Cut: 0.001" EDM wire Price: $90 Spot size: 75um - 150um Beautiful tip. Made by Die-Tech semiconductor tooling. Excellent spot size and consistency. Difficult to clean, but worth the effort. |